WO2015169481A1 - Diaphragm spring valve - Google Patents

Abstract

The present invention relates to a diaphragm spring valve which comprises a valve carrier (2) with a through-opening (20), a diaphragm spring (3; 4) with an inner sealing part (30), an outer supporting part (31) and a plurality of spring arms (32; 42) which connect the inner sealing part (30) to the outer supporting part (31), wherein the diaphragm spring (3; 4) is arranged on the valve carrier (2), and wherein the inner sealing part (30) closes or opens the through-opening (20) in the valve carrier, characterized in that, with the diaphragm spring valve in the closed state, the diaphragm spring (3; 4) is configured, by means of the plurality of the spring arms (32; 42), to exert a prestress on the inner sealing part (30) in order to close the through-opening (20). The present invention further relates to a diaphragm spring which is designed as a deformation diaphragm spring with plastically deformed spring arms (42).

Description

 Description title

 Membrane spring valve prior art

The present invention relates to a diaphragm spring valve which is e.g. can be used as an inlet valve in a fuel pump, or a

Diaphragm spring, which can be used in a diaphragm spring valve.

Such a diaphragm spring is known for example from GB 2478876B. Such diaphragm spring valves have a diaphragm spring and a

Valve carrier with a valve seat and a through hole on. The

Diaphragm spring has an inner seal member, an outer support member and a plurality of spring arms, which connects the inner seal member with the outer support member, and is fixed to the valve carrier. When medium under pressure on the diaphragm spring, the diaphragm spring lifts off from the valve seat and the medium can through the released cross section of

Flow diaphragm spring. In the spring arms of the diaphragm spring, a restoring force builds up in accordance with the deflection, which aims to return the diaphragm spring to its initial position. As soon as the medium flowing through is no longer under pressure against the diaphragm spring, it closes

Diaphragm spring automatically by the restoring force of the spring arms. As soon as the diaphragm spring rests again on the valve carrier, it seals the

Through opening against back-flowing medium. However, on the one hand the tightness of the diaphragm spring valve with respect to tolerances and evenness can not be guaranteed safe. The reason for this is that the deflection of the diaphragm spring at the end of the closing process is getting smaller and thus the restoring force and the closing force of the spring arms is close to zero. On the other hand, the provision of the diaphragm spring when terminating the

Closing process by the constantly reducing restoring force are slowing down, whereby the closing process can take longer. This makes an application of the known diaphragm spring in dynamic systems and / or partially pressureless systems very difficult.

Disclosure of the invention

The membrane spring valve according to the invention with the features of claim 1 has the opposite on the advantage that the valve dynamics and the

Valve tightness of the diaphragm spring valve can be improved. Thus, the membrane spring valve according to the invention can be used in partially pressureless systems. This is inventively achieved in that the

Diaphragm spring valve comprises a diaphragm spring which has a bias in the closed state of the diaphragm valve. The bias can either by a plastic pre-deformation of the diaphragm spring per se before installation in the diaphragm spring valve or by a deformation of the

Diaphragm spring, which exceeds the shape of the valve carrier when installing the

 Diaphragm spring is generated in the diaphragm spring valve arise. Here, the diaphragm spring valve according to the invention comprises the valve carrier having a through hole, the diaphragm spring with an inner sealing member, an outer support member and a plurality of spring arms which connect the inner sealing member with the outer support member, wherein the diaphragm spring on

Valve carrier is arranged, and wherein the inner sealing member the

Passage opening of the valve carrier closes or releases. In the closed state of the diaphragm spring valve, the diaphragm spring is adapted to exert by means of the plurality of spring arms a bias on the inner sealing member to close the through hole and so in all

 Operating conditions to allow a dynamic, safe closing.

The dependent claims show preferred developments of the invention. Preferably, the valve carrier may have a first surface and a second surface which are arranged in two different mutually parallel planes, wherein in the closed state of the diaphragm spring valve, the inner sealing part of the diaphragm spring is arranged on the first surface and the outer support part is arranged on the second surface , Thus, a bias on the inner sealing member by means of the spring arms of

Diaphragm spring be exercised by a structural adaptation of the valve carrier in a simple manner. The valve carrier may, for example, have a projection, whereby the first and second surface arise. The first surface on which the inner sealing member may be disposed may be formed on the projection. The second surface then corresponds to the surface of the valve carrier, which surrounds the projection and on which the outer support member may be arranged. Furthermore, the bias voltage can be adjusted directly over the height of the projection.

More preferably, the diaphragm spring may be a flat diaphragm spring. As a flat diaphragm spring is a diaphragm spring to understand, the inner sealing member and outer support member in the unloaded state before installing the

Diaphragm spring lie in the diaphragm spring valve or on the valve carrier in a common plane. Thus, in a quick and easy way, a bias voltage can be ensured directly when installing the diaphragm spring in the diaphragm spring valve. As a result, further steps for generating the bias voltage can be avoided.

Alternatively, preferably, the diaphragm spring may be a deformation diaphragm spring with plastically deformed spring arms. As a deformation diaphragm spring is to be understood a diaphragm spring whose inner sealing member and the outer support member in the unloaded state before installing the

Diaphragm spring in the diaphragm spring valve or on the valve carrier do not lie in a common plane. For producing a deformation diaphragm spring, e.g. a flat diaphragm spring are mechanically opened so far that the spring arms are loaded beyond their elastic limit, wherein the plastic deformation remains when relaxing. By using a

Deformation diaphragm spring can be adjusted depending on the application, the bias of the diaphragm spring so that even larger biases, for. in very dynamic systems without providing a projection on the valve carrier are possible. This can lead to a compact design of the diaphragm spring valve.

More preferably, the inner sealing member and the outer support member may be in the closed state of the diaphragm spring valve in a common plane of the valve carrier, resulting in the generation of a bias of the

Deformation diaphragm spring in the case of a flat valve carrier leads. According to a still further alternative embodiment of the present invention, preferably, a minimum width of a spring arm may be less than a minimum distance between the spring arm and the inner seal member and less than a minimum distance between the spring arm and the outer support member. Thus, a large release cross-section can be ensured for the medium to be delivered. This is particularly important in relatively low pressure systems where the sealing member can only partially lift off the valve support or valve seat. Thus, despite the incomplete opening of the diaphragm spring valve, a sufficient flow of the medium to be delivered can be ensured.

Further preferably, the spring arms have no overlapping areas in the circumferential direction to each other. As a result, on the one hand, a larger release cross section for the medium to be delivered can be ensured. On the other hand, the flow of the medium to be pumped can be facilitated, whereby the pressure losses can be reduced.

Preferably, the passage opening may be cylindrical or stepped. Depending on the application, the flow of the medium to be delivered in front of the diaphragm spring can thus be adjusted accordingly.

Furthermore, the present invention relates to a diaphragm spring having the features of claim 9. Here, the diaphragm spring according to the invention is a

Deformation diaphragm spring with plastically deformed spring arms. Due to the plastic deformation of the spring arms, a bias of the spring arms of the deformation diaphragm spring can be ensured in the closed state of the diaphragm spring valve.

Furthermore, the present invention relates to a fuel pump, comprising a diaphragm spring valve and / or a diaphragm spring according to one of the preceding claims. Thus, a clock-accurate function of the fuel pump or delivery of fuel can be made possible in a simple and cost-effective manner and delivery losses are reduced at the valve.

Furthermore, the present invention relates to a vehicle comprising a

Diaphragm spring valve and / or a diaphragm spring and / or a fuel pump according to one of the preceding claims. Thus, a fail-safe and clock-accurate function of an internal combustion engine of the vehicle are made possible.

Brief description of the drawings

Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings, wherein like or functionally identical parts are designated by the same reference numerals. In the drawing is:

Figure 1 is a schematic, highly simplified sectional view of a

 Diaphragm spring valve in the closed state according to the first embodiment of the present invention,

FIG. 2 is a plan view of the diaphragm spring valve shown in FIG.

Figure 3 is a schematic, highly simplified sectional view of the FIG.

 1 in the unassembled state, wherein the diaphragm spring is a deformation diaphragm spring,

Figure 4 is a perspective view of a flat diaphragm spring for

 Representation of the manufacturing process of a deformation diaphragm spring,

FIG. 5 is a side view of a flat diaphragm spring extended beyond its elastic limit for illustrating the

 Manufacturing method of a deformation diaphragm spring,

FIG. 6 is a side view of a deformation diaphragm spring;

Figure 7 is a schematic, highly simplified sectional view of a

 Diaphragm spring valve in the closed state according to a second embodiment of the present invention,

Figure 8 is a schematic, highly simplified sectional view of the FIG.

7 membrane spring valve in the unassembled Condition, wherein the diaphragm spring is a flat diaphragm spring, and

Figure 9 is a sectional view of a portion of a fuel pump having two diaphragm spring valves according to the invention.

Embodiments of the invention

Hereinafter, with reference to Figures 1 to 6 a

Diaphragm spring valve 1 according to a first preferred embodiment of the present invention described in detail.

As can be seen from FIGS. 1 and 2, the diaphragm spring valve 1 according to the invention comprises a valve carrier 2 with a graduated one

Through hole 20 and a diaphragm spring in the form of a deformation diaphragm spring 4, which has an inner circular sealing member 30, an outer annular support member 31 having an outer diameter D1 and three spring arms 42.

As a deformation diaphragm spring 4 is a diaphragm spring to understand their inner sealing member 30 and the outer support member 31 in mechanical

be relieved state before installation of the deformation diaphragm spring 4 in the diaphragm spring valve 1 and the valve carrier 2 parallel to each other and spaced apart, wherein the spring arms 42 are plastically deformed. This can be seen in FIGS. 3 and 6.

The spring arms 42 connect the inner sealing member 30 with the outer support member 31, wherein the spring arms 42 is substantially arcuate in

Circumferential direction. Furthermore, the three spring arms 42 are uniformly distributed in the circumferential direction, namely at an angle α of 120 ° to each other, so that the spring arms 42 no overlap areas in

Have circumferential direction to each other (Figure 2).

Further, the spring arms 42 are formed so that a minimum width of a spring arm 42 is smaller than a minimum distance between the spring arm 42 and the outer support member 31 and smaller than a minimum distance between the spring arm 42 and the inner seal member 30. Further, the valve carrier 2, on which the deformation diaphragm spring 4 is disposed, is formed cylindrically and has a diameter D2 which is slightly larger than the diameter D1 of the outer support member 31.

It should be noted that Figures 1 and 2, the inventive

Diaphragm spring valve 1 in the assembled, closed state show. The closed state of the diaphragm spring valve 1 means that no medium can flow through the diaphragm spring valve 1.

In contrast to Figures 1 and 2, Figure 3 shows the diaphragm spring valve 1 according to the first embodiment of the present invention in an unassembled state. Accordingly, the

Deformation diaphragm spring 4 and the spring arms 42 in a mechanically relieved state, so that the outer support member 31 and the inner sealing member 30 are not in a common plane.

To make the deformation diaphragm spring 4, e.g. a

Flat diaphragm spring 3 with flat, not pre-formed spring arms 32 are used (Figure 4). In particular, as a flat diaphragm spring 3 a diaphragm spring is to be understood that the inner sealing member 30 and the outer support member 31 are in mechanically relieved state prior to installation of the flat diaphragm spring 3 in the diaphragm spring valve 1 and the valve carrier 2 in a common plane E.

The flat diaphragm spring 3 is mechanically deformed in a direction R perpendicular to the plane E so far that the spring arms are uniformly loaded beyond their elastic limit (FIG. 5). This leaves after the

Removal of the stress of the flat diaphragm spring 3 plastic deformation left. Thus, the deformation diaphragm spring 4 is formed, wherein the spring arms 42 are plastically deformed (Figure 6).

By placing the deformation diaphragm spring 4 on the flat

Valve carrier 2, the plastically deformed spring arms 42 are flattened (Figure 1). Accordingly, in the closed state of the diaphragm spring valve 1 the inner seal member 30 and the outer support member 31 in a common plane E3.

Thus, the spring arms 42 exert in the assembled or in the closed state of the diaphragm spring valve 1, a bias, which is characterized by the arrow F in Figure 1, on the inner sealing member 30 to the

To close passage opening 20. Due to this bias, the closing operation of the diaphragm spring valve 1 can be performed faster and better tightness of the through hole 20 can be ensured.

Hereinafter, with reference to FIGS. 7 and 8

Diaphragm spring valve 1 according to a second preferred embodiment of the present invention described in detail.

The second embodiment of the diaphragm spring valve 1 according to the invention differs in principle from the first embodiment in that the bias, which is exerted on the inner sealing member 30, formed by the design of the valve carrier 2.

As can be seen in FIGS. 7 and 8, the valve carrier 2 has a cylindrical passage opening 20, a first surface 21 and a second surface 22, the first surface 21 and the second surface 22 being formed by the presence of a projection 23. Furthermore, the first surface 21 and the second surface 22 are not in a common plane but in two

arranged corresponding to each other parallel planes E1 and E2.

Here, the diaphragm spring is in the form of a flat diaphragm spring 3 of Figure 5, which is also seen in Figure 8, i. without plastically deformed spring arms.

FIG. 8 shows the diaphragm spring valve 1 according to the second exemplary embodiment of the present invention in an unassembled state, that is to say prior to installation of the flat membrane spring 3 in the diaphragm spring valve 1 or on the valve carrier 2. In the assembled, closed state of the diaphragm spring valve 1, which is shown in Figure 7, the inner sealing member 30 of the

Flat diaphragm spring 3 arranged on the first surface 21 of the valve carrier, wherein the outer support member 31 is disposed on the second surface 22.

As a result, the spring arms 32 are deformed such that the spring arms 32 a bias, which is indicated by the arrow F, on the inner

Apply sealing member 30 for closing the through hole 20.

Hereinafter, an application of the invention

Diaphragm spring valve 1 in a fuel pump 5 and the general function of the fuel pump 5 described with reference to FIG 9.

The fuel pump 5, which is only partially shown, is in the form of a

Magnetic piston pump formed. Accordingly, the fuel pump 5 has a piston 50 for conveying fuel, a solenoid 51 for actuating the piston 50, and a return element 52 for returning the piston 50 to an initial position. Further, the fuel pump 5, a first inventive diaphragm valve 53 as an inlet valve, a second

Diaphragm valve 54 according to the invention on and a delivery chamber 55. Both diaphragm valves each comprise a deformation spring.

The fuel pump 5 sucks fuel via the first invention

Diaphragm valve 53 (inlet valve) by the actuation of the piston 50 in a first direction A in the delivery chamber 55 at. The sucked fuel is then in a second direction B, the actuation of the piston 50, the

opposite to the first direction A is set in the delivery chamber 55 under pressure and from the second diaphragm valve 54 (exhaust valve) further promoted.

It should be noted that the embodiments described above are for the understanding of the present invention and insofar not as

should be considered restrictive. For example, e.g. at the second time

Embodiment, the use of a deformation diaphragm spring 4 instead of a flat diaphragm spring 3 also possible.

By the diaphragm spring valve 1 according to the invention, the above-mentioned disadvantages of the prior art can be eliminated. In particular, the closing operation of the diaphragm valve 1 can be performed faster and the sealing the passage opening 20 are ensured, which is based on the applied bias on the inner sealing member 30 of the invention

Diaphragm spring is based in the closed valve state. Furthermore, the diaphragm spring valve 1 according to the invention may e.g. be used in dynamic systems, which is particularly important e.g. for fuel pumps used in vehicles.

Claims

Expectations 1 . Diaphragm spring valve, comprising: - a valve carrier (2) with a through opening (20), - a diaphragm spring (3; 4) with an inner sealing part (30), an outer support part (31) and a plurality of spring arms (32; 42), which connect the inner sealing part (30) with the outer support part (31), - wherein the diaphragm spring (3; 4) is arranged on the valve carrier (2), and - wherein the inner sealing part (30) covers the through opening (20) of the Valve carrier (2) closes or releases, - characterized in that - When the diaphragm spring valve is closed, the diaphragm spring (3; 4) is set up to exert a preload on the inner sealing part (30) by means of the plurality of spring arms (32; 42) in order to close the through opening (20). 2. Diaphragm spring valve according to claim 1, characterized in that the valve carrier (2) has a first surface (21) and a second surface (22), which are arranged in two different mutually parallel planes (E1, E2), in the closed state of the diaphragm spring valve, the inner sealing part (30) of the diaphragm spring (3; 4) is arranged in the first surface (21) and the outer support part (31) is arranged in the second surface (22). Diaphragm spring valve according to claim 2, characterized in that the diaphragm spring is a flat diaphragm spring (3) is. 4. Diaphragm spring valve according to claim 1 or 2, characterized in that the diaphragm spring is a deformation diaphragm spring (4) with plastically deformed spring arms (42). 5. Diaphragm spring valve according to claim 1 or 4, characterized in that in the closed state of the diaphragm spring valve, the inner sealing part (30) and the outer support part (31) lie in a common plane (E3) of the valve carrier. Diaphragm spring valve according to one of the preceding claims, characterized in that a minimum width of a spring arm (32; 42) is smaller than a minimum distance between the spring arm (32; 42) and the inner sealing part and smaller than a minimum distance between the spring arm (32; 42); 42) and the outer support part (31). Diaphragm spring valve according to one of the preceding claims, characterized in that the spring arms (32; 42) have no overlap areas with one another in the circumferential direction. Diaphragm spring valve according to one of the preceding claims, characterized in that the through opening (20) is cylindrical or stepped. Diaphragm spring, characterized in that the diaphragm spring is a deformation diaphragm spring (4) with plastically deformed spring arms (42). Fuel pump, comprising a diaphragm spring valve (1) or a Diaphragm spring (3; 4) according to one of the preceding claims. Vehicle, comprising a diaphragm spring valve (1) and/or a Diaphragm spring (3; 4) and/or a fuel pump (5) according to one of the preceding claims.